School punishment (5)
'school punishment' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for detention that I've seen before include "Custody" , "After-school punishment" , "Arrest; school punishment" , "Confinement" .)
'school punishment' is the definition.
(writing the same thing over and over)
This is all the clue.
(Other definitions for lines that I've seen before include "imposition" , "Wrinkles; rail tracks" , "old-fashioned school punishment" , "Ranks" , "writing done by pupil?" .)